(Winner of the 2011 Royal Society Winton Prize for Science Books) One bright February afternoon on a beach in Cornwall, Gavin Pretor-Pinney took a break from cloudspotting and started watching the waves rolling into shore. Mesmerized, he wondered where they had come from, and soon found that they are everywhere around us. This follow-up to The Cloudspotter's Guide considers the many forms of waves that govern our very existence, from the rippling beats of our hearts and the signals across our brains to the waves of light and vibration that give us vision and music, and the microwaves and infrared waves by which we communicate.